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(use-modules (base64)
(captcha)
(json)
(srfi srfi-1)
(srfi srfi-11)
(srfi srfi-13)
(srfi srfi-26)
(rnrs bytevectors)
(ice-9 match)
(web server)
(web request)
(web response)
(web uri))
;; Data model for comments:
;; CREATE TABLE comments(
;; id SERIAL PRIMARY KEY,
;; approved TIMESTAMP,
;; submitted TIMESTAMP NOT NULL,
;; slug VARCHAR(100) NOT NULL,
;; name VARCHAR(50) NOT NULL,
;; email VARCHAR(100),
;; url VARCHAR(100),
;; comment VARCHAR(1024) NOT NULL
;; );
;; Use `now' for `submitted'.
;; Globals.
(define challenges (make-hash-table))
;; (define conn (connect-to-postgres-paramstring "dbname=jakob-comments"))
;; Util.
(define (acons-list k v alist)
"Add V to K to alist as list"
(let ((value (assoc-ref alist k)))
(if value
(let ((alist (alist-delete k alist)))
(acons k (cons v value) alist))
(acons k (list v) alist))))
(define (list->alist lst)
"Build a alist of list based on a list of key and values.
Multiple values can be associated with the same key"
(let next ((lst lst)
(out '()))
(if (null? lst)
out
(next (cdr lst) (acons-list (caar lst) (cdar lst) out)))))
(define (decode-form bv)
"Convert BV querystring or form data to an alist"
(define string (utf8->string bv))
(define pairs (map (cut string-split <> #\=)
;; semi-colon and amp can be used as pair separator
(append-map (cut string-split <> #\;)
(string-split string #\&))))
(list->alist (map (match-lambda
((key value)
(cons (uri-decode key) (uri-decode value)))) pairs)))
(define (request-path-components request)
(split-and-decode-uri-path (uri-path (request-uri request))))
(define (not-found request)
(values (build-response #:code 404)
(string-append "Resource not found: "
(uri->string (request-uri request)))))
;;
(define (get-comments request body)
(values '((content-type . (application/json)))
(scm->json-string
'((title . "whoa buddy")
(author . "Jakob Kreuze")
(date . "2022-03-27")
(text . "bad take, bad take!")))))
(define (put-comment request body)
(display (decode-form body))
(newline)
(values '((content-type . (text/plain))) "Hello hacker!"))
(define (make-challenge request body)
(let-values (((uuid value image) (new-captcha)))
(hash-set! challenges uuid value)
(hash-for-each (lambda (x y) (display x) (newline)) challenges)
(values `((content-type . (application/base64))
(access-control-allow-origin . "*")
(x-captcha-id . ,uuid))
(base64-encode image))))
(define (handle-api-request request body endpoint)
(display (cons (request-method request) endpoint))
(newline)
((match (cons (request-method request) endpoint)
('(GET "challenge") make-challenge)
('(GET "comments") get-comments)
('(POST "comment") put-comment)
(_ (lambda (. args) (not-found request))))
request body))
(define (main-request-handler request body)
(let ((path (request-path-components request)))
(if (string= "api" (first path))
(handle-api-request request body (drop path 1))
(not-found request))))
(run-server main-request-handler 'http '(#:port 8081))
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